118 



^'allou of lime-sulphur to fifty gallons of water, but where 

 treatments were made at that strength, injury to foliage 

 usually followed. It is my experience that if you have 

 failed to make that early spraying with either the lime- 

 sulphur solution or the Bordeaux mixture as the buds are 

 commencing to swell, you have missed your opportunity to 

 combat that disease. I do not know^ of anything you can 

 put on the trees when the disease is thoroughly established 

 in the foliage \\1hich will afford any protection to them. I 

 would not recommend your formula for spraying as you sug- 

 gest Avhen leaves are expanded. 



A MEMBER : Is formaldahyde an equally good disin- 

 fectant! 



PROF. PARROTT : I think it is used, but the treatment 

 of cankers is out of my field. I have heard our plant path- 

 ologist recommend corrosive sublimate and copper sulphate 

 solution. 



A MEMBER: Have you had any experience with clover 

 mite on apple trees? 



PROF. PARROTT : I have not had a great deal of ex- 

 l)erience with the pest. I was especially interested in this 

 discussion this morning regarding the presence 'of mites on 

 iHspberries, since we have several species of red mites, in- 

 cluding the one you mentioned that attacks both bush and 

 tree fruits. As regards apple orchards. I have always said 

 that the man who sprays thoroughly with lime-sulphur so- 

 lution at summer strength ought to have no trouble with 

 cJover mites, providing he sprays thoroughly, covering the 

 upper and lower surface of the foliage. Jn the Hudson 

 River Valley they claim it is impossible to protect raspber- 

 ries from mites by that spraying, and yet in western New 

 York in apple plantings I have been as thoroughly con- 

 vinced as any man could be that spraying with lime-sulphur, 

 i:sing one gallon to 50 gallons of water has protected apple 

 foliage, providing one sprays thoroughly and covers all 

 surfaces of the leaves. 



THE CHAIRMAN: Now, friends, we have kept Prof. 



